Scratch-gui: Cannot click "play" button in this 2.0 project

[paulkaplan]

Expected Behavior

_Please describe what should happen_

After hitting the green flag, hitting the button labeled "play" should start the game.

Actual Behavior

_Describe what actually happens_

It does not start the game.

Steps to Reproduce

_Explain what someone needs to do in order to see what's described in Actual behavior above_

1. Open this project https://llk.github.io/scratch-gui/develop/#177260519
2. Click green flag
3. Click "play"

Operating System and Browser

Mac 10.12.6, Chrome 62.0.3202.94

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Investigating further, I also noticed you cannot open the costume editor for many of these sprites, including the button sprite that also cannot be clicked. There is the scratch-paint SVG import failed: error, and similar to the watermelon costume, the svg has these strange prefixed <svg:svg ...> tags. I wonder if this is related to not being able to click it, possibly the renderer can render it but is having trouble measuring the bounding box or something?

[paulkaplan]

Following up from that investigation, I believe the costume editor connection is a red herring. It is tracked in https://github.com/LLK/scratch-paint/issues/209.

I believe I've found the root cause: hidden sprites can still block blocks. For example, this project has a big sprite in front of the cat that is hidden on green flag. You cannot click the cat. However, in scratch 2, you can. https://llk.github.io/scratch-gui/develop/#191710132

@cwillisf this seems like a picking problem?

[thisandagain]

This would actually explain quite a few of the compatibility problems we have been seeing on other projects as well. Raising this to critical.